package com.example.tianxiaoyu.spinnertest_128txy;

import android.content.Context;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
    private TextView tvinfo;
    private Spinner spinner;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        init();

        //定义数据源
        String[] cities={"北京","上海","大连","天津"};
        //定义适配器
        ArrayAdapter<String> adapter=new ArrayAdapter<String>(
                this,//上下文
                android.R.layout.simple_spinner_item,//条目布局
                cities//数据源
        );
        //设置Spinner下拉按钮样式----3
        adapter.setDropDownViewResource(
                android.R.layout.simple_spinner_item);
        //Spinner与Adapter绑定-----4
        spinner.setAdapter(adapter);
        //Spinner点击条目时间-----5
        spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> adapterView, View view, int i, long id) {
                tvinfo.setText("您选择的是："
                +adapterView.getItemAtPosition(i).toString());
            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {
//不操作
            }
        });
    }

    private void init() {
        tvinfo=(TextView)findViewById(R.id.textView);
        spinner=(Spinner)findViewById(R.id.spinner);
    }
}
